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The Importance of Spatial Scale for Conservation and Assessment of Anuran Populations in Coastal Wetlands of the Western Great Lakes,USA 总被引:2,自引:0,他引:2
Distributions of pond-breeding amphibians may be influenced by habitat factors at different spatial scales. We used anuran
calling surveys to investigate the association between 5 anuran species and habitat variables measured within 100, 500, 1000,
and 3000 m of sampling points at 63 coastal wetlands along the US shores of Lake Michigan and Lake Huron. Stepwise logistic
regression was used to create predictive models for each species at each spatial scale. Our results confirm the view that
habitat variables at multiple scales influence frog distributions, but the strength of predictive models was significantly
affected by the spatial scale at which habitat variables were derived. Remotely sensed habitat variables within a 3000 m radius
were among the most effective predictors of occurrence for American toad (Bufo americanus), eastern gray treefrog (Hyla versicolor), spring peeper (Pseudacris crucifer), and green frog (Rana clamitans melanota). The western chorus frog (Pseudacris triseriata) was predicted most effectively by variables derived within a 500 m radius. For the most part, these anurans exhibited species-specific
responses to habitat variables; however the suite of landscape-scale variables associated with urban land use appeared in
all species’ regression models. Associations with landscape-scale variables coupled with well-documented habitat needs at
local breeding sites suggest that conservation and assessment of frogs and toads in coastal wetlands should consider the influence
of habitat variables at multiple spatial scales. 相似文献